Amber, until you can get to the Dr., take some Advil. It's an anti-inflammatory and will help your muscles, which will in turn help the headache. It sounds like a tension headache, but sometimes when you get a sinus infection you get that strained feeling in your neck. Sort of like it deperately needs to pop, wich causes horrible, nagging pain.

Does it hurt more when you bend over or cough? Do you have a temperature?